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Burn a DMG or ISO File to Disk (Macintosh)

The instructions below are specific to the Disk Utility program available on the Mac OSX Operating System on the Macintosh computers in IT Computer Classrooms. Even if your computer has a different version of Mac OS X, these instructions should provide a general guide for completing this process. Refer to the documentation provided with your Mac operating system software if you need more specific information.

Burn a DMG or ISO File to Disk

After you have downloaded a program's installation file (*.dmg format for a Mac-compatible program, *.iso format for a Windows-compatible program) to a Macintosh computer's hard drive, you can burn this *.dmg or *.iso file to a blank CD or DVD. You can use this disk to install the program on another computer, or have a backup installation disk in case you need to reinstall the program in the future. You can use a Mac to burn an *.iso file to a disk, and the resulting installation disk will run properly on a Windows computer.

Note: For .dmg or .iso files that are larger than 4.7 GB, you will need to use dual layer DVD. See About Recordable Media Types for more information about different types of recordable DVDs.

To burn a DMG or ISO File to disk:

  1. Start Applications > Utilities > Disk Utility. The Disk Utility window will open. The Mac's available drives (e.g., hard drive partitions, CD/DVD drive) will be listed by name in the left pane.

  2. Insert a blank CD or DVD disc into the Mac CD/DVD drive. Note: If the CD is blank, the You inserted a blank CD pop-up window will appear. Select Action > Open Disk Utility, then click OK. The Disk Utility (a.k.a. SuperDrive) window will reappear. 

  3. Drag the *.dmg or *.iso file from a Finder window or the desktop to the Disk Utility window, and drop it in the left pane in the empty area below the Mac drive names. The *.dmg or *.iso file name will display in the left pane of the Disk Utility.
    Note: You can drag and drop multiple files to the Disk Utility.

  4. Select the *.dmg or *.iso name in the left pane of the Disk Utility, then click Burn (top left). The Burn Disc In: window will open and display the destination (your blank CD/DVD) for your file.

  5. In the Burn Disc In: window, click Burn. The Disk Utility Progress window will open and the burning process will begin.

  6. When the burning is complete, the disk is ejected from the drive and the Disk Utility Progress window displays a message that the image burned successfully. Click OK. The Disk Utility Progress window will close.

You can now close the Disk Utility and use your installation disk.

About Recordable Media Types

There are two types of recordable CDs and DVDs: CDs and DVDs labeled "R" can only be recorded on once, while those labeled "RW" allow you to write data to them once and then add more files later. You can also erase the data on CD-RW or DVD-RW disks entirely and re-use them, which you can't do with DVD/CD-Rs. You can use either kind in IT Computer Classrooms.

For dmg or *.iso files that are larger than 4.7 GB, you will need to use dual layer DVD.